#!/usr/bin/perl

# Copyright 2000-2002 Katipo Communications
#
# This file is part of Koha.
#
# Koha is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# Koha is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Koha; if not, see <http://www.gnu.org/licenses>.

use Modern::Perl;

use CGI qw ( -utf8 );
use C4::Auth qw( get_template_and_user );
use C4::Output qw( output_html_with_http_headers );
use C4::Context;
use C4::Reports qw( GetDelimiterChoices );

use Koha::ItemTypes;
use Koha::Patron::Categories;

=head1 NAME

plugin that shows a stats on borrowers

=head1 DESCRIPTION

=cut

my $input = CGI->new;
my $fullreportname = "reports/bor_issues_top.tt";
my $do_it   = $input->param('do_it');
my $limit   = $input->param("Limit");
my $column  = $input->param("Criteria");
my @filters = $input->multi_param("Filter");
my $output   = $input->param("output");
my $basename = $input->param("basename");
my ($template, $borrowernumber, $cookie)
    = get_template_and_user({template_name => $fullreportname,
                query => $input,
                type => "intranet",
                flagsrequired => {reports => '*'},
                });
our $sep = C4::Context->csv_delimiter(scalar $input->param("sep"));
$template->param(do_it => $do_it,
        );
if ($do_it) {
# Displaying results
    my $results = calculate($limit, $column, \@filters);
    if ($output eq "screen"){
# Printing results to screen
        $template->param(mainloop => $results, limit=>$limit);
        output_html_with_http_headers $input, $cookie, $template->output;
    } else {
# Printing to a csv file
        print $input->header(-type => 'application/vnd.sun.xml.calc',
                            -encoding    => 'utf-8',
                            -attachment=>"$basename.csv",
                            -filename=>"$basename.csv" );
        my $cols  = @$results[0]->{loopcol};
        my $lines = @$results[0]->{looprow};
# header top-right
        print @$results[0]->{line} ."/". @$results[0]->{column} .$sep;
# Other header
		print join($sep, map {$_->{coltitle}} @$cols);
        print $sep . "Total\n";
# Table
        foreach my $line ( @$lines ) {
            my $x = $line->{loopcell};
            print $line->{rowtitle}.$sep;
			print join($sep, map {$_->{value}} @$x);
            print $sep,$line->{totalrow};
            print "\n";
        }
# footer
        print "TOTAL";
        $cols = @$results[0]->{loopfooter};
		print join($sep, map {$_->{totalcol}} @$cols);
        print $sep.@$results[0]->{total};
    }
    exit;
}

my $dbh = C4::Context->dbh;

# here each element returned by map is a hashref, get it?
my @mime  = ( map { {type =>$_} } (split /[;:]/, 'CSV') ); # FIXME translation
my $delims = GetDelimiterChoices;

my $patron_categories = Koha::Patron::Categories->search_with_library_limits({}, {order_by => ['categorycode']});
my $itemtypes = Koha::ItemTypes->search_with_localization;
$template->param(
	    mimeloop => \@mime,
	  CGIseplist => $delims,
      itemtypes => $itemtypes,
patron_categories => $patron_categories,
);
output_html_with_http_headers $input, $cookie, $template->output;


sub calculate {
    my ($limit, $column, $filters) = @_;

    my @loopcol;
    my @looprow;
    my %globalline;
	my %columns;
    my $grantotal =0;
    my $dbh = C4::Context->dbh;


# Checking filters
    my @loopfilter;
	my @cellmap = (
		"Issue From",
		"Issue To",
		"Return From",
		"Return To",
		"Branch",
		"Doc Type",
		"Bor Cat",
		"Day",
		"Month",
		"Year"
	);
    for (my $i=0;$i<=6;$i++) {
        my %cell;
        if ( @$filters[$i] ) {
            if (($i==1) and (@$filters[$i-1])) {
                $cell{err} = 1 if (@$filters[$i]<@$filters[$i-1]) ;
            }
            $cell{filter} .= @$filters[$i];
			defined ($cellmap[$i]) and
				$cell{crit} .= $cellmap[$i];
            push @loopfilter, \%cell;
        }
    }
    my $colfield;
    my $colorder;
    if ($column){
        $column = "old_issues." .$column if (($column=~/branchcode/) or ($column=~/timestamp/));
        $column = "biblioitems.".$column if $column=~/itemtype/;
        $column = "borrowers."  .$column if $column=~/categorycode/;
        my @colfilter ;
		if ($column =~ /timestamp/) {
        	$colfilter[0] = @$filters[0];
       		$colfilter[1] = @$filters[1];
		} elsif ($column =~ /returndate/) {
        	$colfilter[0] = @$filters[2];
        	$colfilter[1] = @$filters[3];
		} elsif ($column =~ /branchcode/) {
			$colfilter[0] = @$filters[4];
		} elsif ($column =~ /itemtype/) {
			$colfilter[0] = @$filters[5];
		} elsif ($column =~ /category/) {
			$colfilter[0] = @$filters[6];
		} elsif ($column =~ /sort2/   ) {
			# $colfilter[0] = @$filters[11];
		}
                                                
    # loop cols.
        if ($column eq "Day") {
            #Display by day
            $column = "old_issues.timestamp";
            $colfield .="dayname($column)";  
            $colorder .="weekday($column)";
        } elsif ($column eq "Month") {
            #Display by Month
            $column = "old_issues.timestamp";
            $colfield .="monthname($column)";  
            $colorder .="month($column)";  
        } elsif ($column eq "Year") {
            #Display by Year
            $column = "old_issues.timestamp";
            $colfield .="Year($column)";
            $colorder .= $column;
        } else {
            $colfield .= $column;
            $colorder .= $column;
        }  

        my $strsth2;
        $strsth2 .= "SELECT DISTINCTROW $colfield 
                     FROM `old_issues` 
                     LEFT JOIN borrowers   ON old_issues.borrowernumber=borrowers.borrowernumber 
                     LEFT JOIN items       ON old_issues.itemnumber=items.itemnumber 
                     LEFT JOIN biblioitems ON (biblioitems.biblioitemnumber=items.biblioitemnumber)
                     WHERE 1";
        if (($column=~/timestamp/) or ($column=~/returndate/)){
            if ($colfilter[1] and $colfilter[0]){
                $strsth2 .= " AND $column between '$colfilter[0]' AND '$colfilter[1]' " ;
            } elsif ($colfilter[1]) {
                $strsth2 .= " AND $column < '$colfilter[1]' " ;
            } elsif ($colfilter[0]) {
                $strsth2 .= " AND $column > '$colfilter[0]' " ;
            }
        } elsif ($colfilter[0]) {
            $colfilter[0] =~ s/\*/%/g;
            $strsth2 .= " AND $column LIKE '$colfilter[0]' " ;
        }
        $strsth2 .=" GROUP BY $colfield";
        $strsth2 .=" ORDER BY $colorder";

        my $sth2 = $dbh->prepare($strsth2);
        $sth2->execute;
        while (my @row = $sth2->fetchrow) {
			$columns{($row[0] ||'NULL')}++;
            push @loopcol, { coltitle => $row[0] || 'NULL' };
        }

		$strsth2 =~ s/old_issues/issues/g;
		$sth2 = $dbh->prepare($strsth2);
        $sth2->execute;
        while (my @row = $sth2->fetchrow) {
			$columns{($row[0] ||'NULL')}++;
            push @loopcol, { coltitle => $row[0] || 'NULL' };
        }
    }else{
        $columns{''} = 1;
    }

    my $strcalc ;

# Processing average loanperiods
    $strcalc .= "SELECT  CONCAT_WS('', borrowers.surname , \",\\t\", borrowers.firstname),  COUNT(*) AS `RANK`, borrowers.borrowernumber AS ID";
    $strcalc .= " , $colfield " if ($colfield);
    $strcalc .= " FROM `old_issues`
                  LEFT JOIN  borrowers  USING(borrowernumber)
                  LEFT JOIN    items    USING(itemnumber)
                  LEFT JOIN biblioitems USING(biblioitemnumber)
                  WHERE old_issues.borrowernumber IS NOT NULL
                  ";
	my @filterterms = (
		'old_issues.issuedate >',
		'old_issues.issuedate <',
		'old_issues.returndate >',
		'old_issues.returndate <',
		'old_issues.branchcode  like',
		'biblioitems.itemtype   like',
		'borrowers.categorycode like',
	);
    foreach ((@$filters)[0..9]) {
		my $term = shift @filterterms;	# go through both arrays in step
		($_) or next;
		s/\*/%/g;
		$strcalc .= " AND $term '$_' ";
	}
    $strcalc .= " GROUP BY borrowers.borrowernumber";
    $strcalc .= ", $colfield" if ($column);
    $strcalc .= " ORDER BY `RANK` DESC";
    $strcalc .= ",$colfield " if ($colfield);
    $strcalc .= " LIMIT $limit" if ($limit);

    my $dbcalc = $dbh->prepare($strcalc);
    $dbcalc->execute;
	my %patrons = ();
	# DATA STRUCTURE is going to look like this:
	# 	(2253=> {name=>"John Doe",
	# 				allcols=>{MAIN=>12, MEDIA_LIB=>3}
	# 			},
	# 	)
    while (my @data = $dbcalc->fetchrow) {
        my ($row, $rank, $id, $col) = @data;
        $col = "zzEMPTY" if (!defined($col));
		unless ($patrons{$id}) {
			$patrons{$id} = {name=>$row, allcols=>{}, newcols=>{}, oldcols=>{}};
		}
		$patrons{$id}->{oldcols}->{$col} = $rank;
    }

	
	$strcalc =~ s/old_issues/issues/g;
    $dbcalc = $dbh->prepare($strcalc);
    $dbcalc->execute;
    while (my @data = $dbcalc->fetchrow) {
        my ($row, $rank, $id, $col) = @data;
        $col = "zzEMPTY" if (!defined($col));
		unless ($patrons{$id}) {
			$patrons{$id} = {name=>$row, allcols=>{}, newcols=>{}, oldcols=>{}};
		}
		$patrons{$id}->{newcols}->{$col} = $rank;
    }

	foreach my $id (keys %patrons) {
		my @uniq = keys %{{ %{$patrons{$id}->{newcols}}, %{$patrons{$id}->{oldcols}} }};		# get uniq keys, see perlfaq4
		foreach (@uniq) {
			my $count = ($patrons{$id}->{newcols}->{$_} || 0) +
						($patrons{$id}->{oldcols}->{$_} || 0);
			$patrons{$id}->{allcols}->{$_} = $count;
			$patrons{$id}->{total} += $count;
		}
	}
    
	my $i = 1;
	my @cols_in_order = sort keys %columns;		# if you want to order the columns, do something here
	my @ranked_ids = sort {
						   $patrons{$b}->{total} <=> $patrons{$a}->{total}
						|| $patrons{$a}->{name}  cmp $patrons{$b}->{name}
						} keys %patrons;
    foreach my $id (@ranked_ids) {
        my @loopcell;

        foreach my $key (@cols_in_order) {
			if($column){
		      push @loopcell, {
				value => $patrons{$id}->{name},
				reference => $id,
				count => $patrons{$id}->{allcols}->{$key},
			  };
			}else{
			  push @loopcell, {
				value => $patrons{$id}->{name},
				reference => $id,
				count => $patrons{$id}->{total},
			  };  
			}
        }
        push @looprow,{ 'rowtitle' => $i++ ,
                        'loopcell' => \@loopcell,
                        'hilighted' => ($i%2),
                    };
        # use a limit, if a limit is defined
        last if $i > $limit and $limit
    }

    # the header of the table
    $globalline{loopfilter}=\@loopfilter;
    # the core of the table
    $globalline{looprow} = \@looprow;
    $globalline{loopcol} = [ map {{coltitle=>$_}} @cols_in_order ];
 	# the foot (totals by borrower type)
    $globalline{loopfooter} = [];
    $globalline{total}= $grantotal;		# FIXME: useless
    $globalline{column} = $column;
    return [\%globalline];	# reference to a 1 element array: that element is a hashref
}

1;
__END__